Respuesta :
Answer:
-Pencil where first used in 1795.
-A soft black lustrous form of carbon that conducts electricity and use as lead in a pencil and electrolyte anodes, as a lubricant, and as a moderator in nuclear reaction.
- HB pencil is a types of pencil where h stands for hard and B stands for black which
means hard black pencil .
-When h# is increased the pencil will be harder.
Answer:
Pencils have been used since the 16th century. Graphite is a mix of carbon and clay that is combined by being heated in an oven. An HB pencil is the basic pencil most people use for everyday tasks. When the H# is increased, there is less clay. This makes the texture harder and creates a very light sketch.
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